As part of our refurbishment process, we test the entire computer for functionality including memory, hard drive, and optical drive tests. Computer may show minor signs of wear, but the overall condition is considered grade A by our standards. We may replace various parts that have excessive wear such as case parts, bezels, and other components. We then image the unit with a clean, complete installation of Windows 10, including a new product key as required by our Microsoft Authorized Refurbisher agreement.